I would like to bold the axis title as well chage the default font size of the title text. The problem is when write script for both font size and bold only font size chaged and the title doesn't bold and vice versa. I used the following code in ggplot2:
theme_classic()+
theme(axis.title.x = element_text(size= 6, face = "bold"))+
theme(axis.title.y = element_text(size= 6, face = "bold"))